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WO2018122636A1 - Additif et procédé pour améliorer l'efficacité de déshydratation dans la fabrication de papier - Google Patents

Additif et procédé pour améliorer l'efficacité de déshydratation dans la fabrication de papier Download PDF

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Publication number
WO2018122636A1
WO2018122636A1 PCT/IB2017/055827 IB2017055827W WO2018122636A1 WO 2018122636 A1 WO2018122636 A1 WO 2018122636A1 IB 2017055827 W IB2017055827 W IB 2017055827W WO 2018122636 A1 WO2018122636 A1 WO 2018122636A1
Authority
WO
WIPO (PCT)
Prior art keywords
paper
additive
preparing
dewatering
pulp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2017/055827
Other languages
English (en)
Inventor
Abhay Kumar AGRAWAL
Lars Erik SCHMIDT
Vipulkumar Dhansukhbhai PATEL
Mark CZERNUSCHKA
Manjunatha Nanjundaswamy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Publication of WO2018122636A1 publication Critical patent/WO2018122636A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/82—Pulp catching, de-watering, or recovering; Re-use of pulp-water adding fibre agglomeration compositions
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/18—Highly hydrated, swollen or fibrillatable fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/25—Cellulose
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
    • H01B3/52—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials wood; paper; press board

Definitions

  • the present invention relates to the field of manufacturing of paper used in electrical insulation, and more specifically to an additive and a method for improving dewatering efficiency in paper manufacturing.
  • ⁇ additives also referred to as aids, agents, chemicals etc.
  • a dewatering additive which is used for controlling removal of water in one or more stages of paper making.
  • Dewatering additives are readily available in the market and typically obtained from a supplier(s) according to the process requirements.
  • Various raw materials are used in preparing additives, and there is more than often a significant difference in property of the fibers of the dewatering additive and that of the pulp. Even when the additive is made from similar wooden material as that of the pulp, there is a variation due to the broad variation in the quality of different wooden raw materials.
  • This heterogeneity affects the efficiency of one or more stages of the paper making process, as well as critical mechanical / aesthetic properties of the finished paper including density, tensile strength and color. There is accordingly a need for an additive that enhances efficiency of dewatering, while imparting desired properties to the finished paper.
  • Various aspects of the present invention provide a dewatering additive and a method for preparing paper with the dewatering additive.
  • the paper may be insulation paper, or pressboard having certain electrical, chemical and mechanical properties.
  • the dewatering additive is obtained using the same wood that is used as raw material for preparing the paper (i.e. insulation paper or pressboard).
  • the dewatering additive is prepared from a pulp obtained from the wood.
  • the dewatering additive may be prepared by milling the pulp.
  • the method for preparing paper comprises obtain the pulp from a pulping process by treating wood with fresh water.
  • the method further comprises preparing a stock from the pulp by adding the dewatering additive obtained from the same wood that is used for preparing the pulp.
  • the dewatering additive can be prepared from the pulp obtained from the pulping process.
  • the dewatering additive may be added in a chest box for preparing the stock.
  • a solution of the dewatering additive can be prepared and added for preparing the stock.
  • the method comprises supplying the stock through a wire section, a press section and a drying section for preparing paper.
  • FIG. 1 is a simplified flow diagram of paper manufacturing using a dewatering additive, in accordance with an embodiment of the present invention.
  • Insulation paper or pressboard manufacturing involves processing wood to prepare pulp, which is mixed with various chemical and mineral additives.
  • wood (102) is typically treated with fresh water (104) in pulping (106), to obtain a pulp.
  • the pulp may be a mechanical pulp or a chemical pulp.
  • the same wood (which is used to prepare the pulp), or the pulp prepared by wood ( 102) may be used for preparing the dewatering additive as shown in 108, 110.
  • the dewatering additive can be prepared by milling the pulp (i.e. obtained from the same wood / received as input material).
  • the dewatering additive can be prepared by milling the wood or pulp obtained from the wood, to have fibers with particle sizes much smaller than that of the wood / pulp.
  • the dewatering additive thus prepared is used as an input (112) for preparing stock (114).
  • the dewatering additive can be used along with other chemical / mineral additives (not shown in Fig. 1).
  • the additive can be mixed in a chest box (not shown) for stock preparation.
  • the solution can be prepared separately and added just before the process starts. Once the additive (or solution) is added, the stock needs to be keep continuously stirred to avoid resting of the additive.
  • the additive concentration can vary depending on production set-up.
  • the amount of additive added can be 0.5 % to 10% by weight of the total pulp consumed. For example, 50 kg of dewatering additive can be added with 950 kg of pulp for preparing stock.
  • the stock is typically supplied through a flow spreader and head box (not shown in Fig. 1), as a slurry (wet web) into a wire section (116).
  • This section is typically referred to as a wet end section, and the dewatering additive can be added in this section.
  • Dewatering additives are used at the convenience depending on the type of paper/board manufacturing machines
  • the wire section can have a paper making table and web of wires (e.g. twin wires arranged between rollers), where significant amount of water is removed from the slurry as the paper forming progresses, and the wet web enters into a press section (118) of the paper machine.
  • wires e.g. twin wires arranged between rollers
  • the speed of the paper machine increases by about 5 % to 25 % as compared to the earlier speeds (i.e. without the use of the dewatering additive of the present invention). This is realized by altering machine speed to compensate for the change in level of water line in the wire section due to the use of the dewatering additive.
  • dewatering devices such as suction devices (not shown)
  • suction devices not shown
  • rollers not shown
  • the press section for further removal of moisture, and strengthening / smoothening the wet web, before it enters a drying section (120) of the paper machine (e.g. through one or more rollers (not shown)).
  • the drying section several sections may be present such as dryer section, calendar section, reel building section etc., for further removal of moisture (e.g. as steam (122), finishing, creating rolls of paper (124) and so forth.
  • moisture e.g. as steam (122), finishing, creating rolls of paper (124) and so forth.
  • the dewatering additive is prepared from the same wood (or pulp), it leads to formation of homogenous cellulosic fibers, which provides desired pulp properties as well as in desired water removal in various stages (126).
  • the speed of the machine can be increase in range of 5% to 25%.
  • the original speed of the machine i.e. without the dewatering additive of the present invention
  • the speed after using the dewatering additive of the present invention may be 33 MPM, which indicates a productivity improvement of 10%.
  • the process is substantially similar to that of manufacturing of insulation paper as described in relation to Fig. 1.
  • the dewatering additive is mixed with the pulp for stock preparation, and the stock is passed through the wire section and a press and dry section for obtaining pressboard.
  • the dewatering additive manufactured from the same wood / pulp by preparing and utilizing the dewatering additive manufactured from the same wood / pulp, the effect on the properties (e.g. electrical, mechanical, aesthetic etc.) of the stock and paper is minimized as there is no heterogeneity in the system (mixture of pulp fibers and additive). Accordingly, the appearance (e.g. color etc.) of the finished paper / pressboard is not affected by the dewatering additive.
  • the paper / pressboard has desired mechanical properties (e.g. density, tensile strength etc.) due to the homogeneity in the slurry in various sections of the paper machine.

Landscapes

  • Paper (AREA)

Abstract

L'invention a trait à un additif et un procédé pour améliorer l'efficacité de déshydratation dans un processus de fabrication de papier. L'additif de déshydratation est préparé à partir du même bois qui est utilisé comme matière première pour préparer le papier, qui peut être du papier d'isolation ou du carton comprimé. L'additif de déshydratation peut être préparé à partir de la même pâte à papier qui est utilisée pour préparer une pâte pour la formation de papier/carton. L'additif de déshydratation est ajouté à la pâte à papier pour préparer la pâte qui est fournie à travers diverses sections de la machine à papier pour fabriquer du papier.
PCT/IB2017/055827 2016-12-26 2017-09-26 Additif et procédé pour améliorer l'efficacité de déshydratation dans la fabrication de papier Ceased WO2018122636A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201641044242 2016-12-26
IN201641044242 2016-12-26

Publications (1)

Publication Number Publication Date
WO2018122636A1 true WO2018122636A1 (fr) 2018-07-05

Family

ID=60186328

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2017/055827 Ceased WO2018122636A1 (fr) 2016-12-26 2017-09-26 Additif et procédé pour améliorer l'efficacité de déshydratation dans la fabrication de papier

Country Status (1)

Country Link
WO (1) WO2018122636A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2319984A1 (fr) * 2009-11-04 2011-05-11 Kemira Oyj Verfahren zur Herstellung von Papier
WO2014184442A1 (fr) * 2013-05-15 2014-11-20 Upm-Kymmene Corporation Procédé de fabrication de cellulose nanofibrillaire et de fabrication d'un produit en papier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2319984A1 (fr) * 2009-11-04 2011-05-11 Kemira Oyj Verfahren zur Herstellung von Papier
WO2014184442A1 (fr) * 2013-05-15 2014-11-20 Upm-Kymmene Corporation Procédé de fabrication de cellulose nanofibrillaire et de fabrication d'un produit en papier

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